Paper Title:
Phase Separation of La0.70-xErxSr0.30MnO3 and its Effect on Magnetic and Magnetocaloric Properties
  Abstract

Manganites of general formula ABMnO3 (where A is a trivalent rare-earth ion and B is a divalent dopant) have interesting properties, namely colossal magnetoresistance and their applicability as materials for active magnetic regenerators. La0.70Sr0.30MnO3 (LSMO) is a ferromagnet presenting considerable magnetocaloric effect, with operating temperature TC ~ 370 K and magnetic entropy variation comparable to pure Gadolinium. The high value of TC makes LSMO unsuitable for room-temperature magnetic refrigeration applications, but by substituting La with the high-magnetic moment ion Er, TC is lowered and total magnetic entropy increases. We have found a limit of solid solubility of Er ions in LSMO, in samples prepared by either solid state or sol-gel techniques in previous works [1], in accordance with other authors [2]. We now present a more detailed study of this limit of solubility, with more samples prepared with Er substitution close to the solubility limit and SEM microscopy clearly showing the changes in microstructure caused by the formation of a secondary ErMnO3 phase, in accordance with x-ray diffraction data and TC variation along the series. The magnetocaloric properties of the series are also presented, showing the increase of Relative Cooling Power along the series, in applied magnetic fields up to 1 T.

  Info
Periodical
Materials Science Forum (Volumes 587-588)
Edited by
António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira
Pages
338-342
DOI
10.4028/www.scientific.net/MSF.587-588.338
Citation
J. S. Amaral, M. S. Reis, J. P. Araújo, T. M. Mendonça, P. B. Tavares, V. S. Amaral, J. M. Vieira, "Phase Separation of La0.70-xErxSr0.30MnO3 and its Effect on Magnetic and Magnetocaloric Properties", Materials Science Forum, Vols. 587-588, pp. 338-342, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Nariaki Okamoto, Takashi Fukuda, Tomoyuki Kakeshita, Kohji Kishio
2021
Authors: Takeshi Yokota, Yasutoshi Tsuboi, Shotaro Murata, Shinya Kito, Manabu Gomi
Abstract:We proposed a new type of multi-ferroic system using magnetoelectric (ME:Cr2O3) material/ultra-thin ferroelectric materials (FE)/a...
127
Authors: N.N. Stepanova, S.Yu. Mitropolskaya, D.I. Davidov, N.V. Kazantseva
Abstract:Paramagnetic VKNA superalloy on the base of Ni3Al intermetallic phase (L12 superlattice) under cold rolling deformation demonstrates...
185
Authors: Ryszard Zach, Wiesław Chajec, Janusz Toboła, Daniel Fruchart, El Kebir Hlil, Mohamed Balli, Pierre Wolfers
Abstract:In this report a review of magnetic properties of two groups of intermetallic compounds in relation with their magnetocaloric effect...
180
Authors: Li Hua Yu, Jing Yao, Ze Kun Feng, Ai Ping Huang
Chapter 2: Material Science and its Application
Abstract:Co2Z type planar hexaferrite doping of Nd3+ 2CoO·3BaO ·xNd2O3·(10.8-x)...
555